MD_SHAHRUKH
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Hello everyone,
My question is related to the circuit below.
This is a reference image for the problem which I am facing here. I wanted to know the behaviour of the UC3844 IC in the circuit. How the ISENSE PIN gets input as feedback to control the output pulse to the MOSFET. I am designing a welding system for which the reference circuit is all about. I am understanding that the output pin can give constant frequency using the RT/CT pin and variable duty cycle using the ISENSE pin.
How the duty cycle is changing with changing ISENSE value? I have referred to the UC3844 datasheet where the internal diagram shows that the PWM output turns off if i will give 1V to ISENSE pin, then how it is a current sensing pin?
Please quote me If I have missed something. or provided some insufficient data
Thank you.
My question is related to the circuit below.
This is a reference image for the problem which I am facing here. I wanted to know the behaviour of the UC3844 IC in the circuit. How the ISENSE PIN gets input as feedback to control the output pulse to the MOSFET. I am designing a welding system for which the reference circuit is all about. I am understanding that the output pin can give constant frequency using the RT/CT pin and variable duty cycle using the ISENSE pin.
How the duty cycle is changing with changing ISENSE value? I have referred to the UC3844 datasheet where the internal diagram shows that the PWM output turns off if i will give 1V to ISENSE pin, then how it is a current sensing pin?
Please quote me If I have missed something. or provided some insufficient data
Thank you.